JPH0151283B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to an improvement in a method for cutting the widthwise end face of a thick plate such as a thick steel plate.

[Conventional technology]

In manufacturing steel plates, as shown in Figure 2, the steel plate 3 after rolling has dimensions with a slight margin added to the product dimensions, so there is margin at the leading edge in the longitudinal direction and at both ends in the width direction. , that is, crop 3
A (shaded area). These crops 3A are cut by an end shear and a side shear on a finishing line, and the steel plate is finished to a predetermined product size. Incidentally, rolling technology has made remarkable progress in recent years, and the planar shape of a steel plate before finishing after rolling can now be nearly rectangular, and its dimensional accuracy has also improved. Conventionally, crops in the width direction of steel plates have been sheared by a guillotine shear for thick steel plates, and by a trimmer using a round-blade knife for thin steel plates. Here, the scrap allowance (margin) is required to be at least equivalent to the plate thickness in order to perform shearing reliably, and this has been one of the causes of reduced product yield. In other words, if there is not enough margin to correspond to the thickness of the plate, when shearing it, the material to be sheared, the crop, may get caught between the upper and lower cutters and damage the shearing equipment. This is because a margin must be provided. In this way, crop removal by shearing method is
Due to the limited product yield, in recent years a side trimming method has been proposed in which both end faces in the width direction of a thick steel plate after rolling are cut using an inclined cutter, as disclosed in, for example, Japanese Patent Laid-Open No. 60-99511. has been done. As shown in FIG. 3, this side trimming method involves placing a cutter 2, which has a cutting edge on its outer circumferential surface that is twisted at a certain angle with respect to the rotating shaft 1, facing the end surface in the width direction of a thick steel plate 3. 2 rotation axis 1
is inclined with respect to the thickness direction of the thick steel plate 3 in a plane parallel to the end surface, and the cutter 2
The end face of the thick steel plate 3 in the width direction is trimmed by rotationally driving the steel plate 3. Here, the inclination direction of the rotating shaft 1 in the cutter 2 is inclined toward the feeding direction F side of the thick steel plate 3,
This improves cutting efficiency by thinning chips, and achieves quiet and efficient cutting by distributing the load during heavy cutting due to the effect of the pulling cutting speed and the lead angle of the cutting edge. It is. In the figure, symbol C indicates the direction of rotation of the cutter 2. In such an inclined cutter cutting method,
The width of the cutter 2 is selected and set so that the end face of the thick steel plate to be cut is the maximum thickness.

[Problems to be solved by the invention]

However, in most cases, the thickness of the thick steel plate to be trimmed by the cutter is thinner than the maximum thickness, and only a part of the cutting edge of the cutter is used. There was a problem in that, depending on the lifespan of the blade, the entire cutter had to be discarded even if the remaining part could be used. On the other hand, as shown in FIG. 4, the rotating shaft 1 is arranged in the thickness direction of the thick steel plate 3, that is, in the direction orthogonal to the feeding direction of the thick steel plate 3, and the cutter 2 is moved in the orthogonal direction G. A method of reciprocating the cutter 2 has been proposed, but even if such a method of reciprocating the cutter is applied to the inclined cutter cutting method shown in FIG. If the pull-off effect becomes large and moves in the opposite direction, the pull-off effect will be canceled out, resulting in a problem that the pull-off effect cannot be used effectively. This invention was made in view of the above-mentioned conventional problems, and it is possible to effectively utilize the cutting edge over its entire length without impairing the pulling effect that is a feature of the inclined cutter cutting method. The object of the present invention is to provide a method for cutting the end face of a thick plate.

[Means to solve the problem]

In this invention, a cutter having a cutting edge twisted at a certain angle with respect to the rotational axis on the outer peripheral surface is opposed to the widthwise end surface of the thick plate, and the rotational axis of the cutter is set in a plane parallel to the end surface. In the method for cutting an end face of a thick plate, the cutter is tilted with respect to the thickness direction of the thick plate, and the cutter is driven and rotated to trim the end face in the width direction of the thick plate. The cutter is moved from one thickness direction to the other across the widthwise end surface of the thick plate only in a direction that increases the cutting effect of the cutter, and the amount of movement and the moving speed are controlled depending on the thickness of the thick plate and The above object is achieved by setting the cutter to cut the entire length range of the end face in the width direction with one movement of the cutter based on cutting conditions including length.

[Effect]

In this invention, the cutter is always moved only in the direction in which its cutting effect appears, and its moving speed is such that it can uniformly cut the end face of one thick plate over its entire length with one movement. This makes it possible to effectively utilize the cutting edge of the cutter over its entire length without impairing the cutting effect.

【Example】

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The method for cutting the end face of a thick plate according to the present invention will be described in detail below with reference to the drawings showing an apparatus for carrying out the method. As shown in FIG. 1, this device inserts a cutter 10, which has a cutting edge 10A on its outer circumferential surface that is twisted at a certain angle with respect to a rotating shaft 12, onto a widthwise end surface 14A of a thick steel plate 14, which is a material to be cut. The rotating shaft 12 of the cutter 10 is tilted at an angle θ with respect to the thickness direction of the thick steel plate 14 in a plane parallel to the end surface 14A, and the cutter 10 is driven and rotated to 14, the cutter 10 is moved from one side to the other in the thickness direction of the thick steel plate 14 in a direction A that increases the cutting effect of the cutter 10. The cutter 10 is moved across the widthwise end surface 14A of the thick steel plate 14 only when the cutter 10 is moved, and the amount of movement and the moving speed are adjusted based on the cutting conditions including the thickness and length of the thick steel plate 14. The width direction end face 14A is set to be cut over its entire length range by movement. Amount of movement S of the cutter 10 in the direction of the rotation axis 12
The moving speed Vs changes depending on conditions such as the passing speed F of the thick steel plate 14, the plate thickness T, and the plate length L, and is determined by the following formula. When the length of the cutting edge 10A of the cutter 10 in the thickness direction of the thick steel plate 14 is Co (=C ₁ + C ₂ ), the diameter of the cutter 10 is D, and the cutting width is t, the cutting edge 10A of the cutter 10 The length Lc of the chips of the thick steel plate 14 that is cut by cutting is Lc=√(2) ² −(2−) ² +T/cosθ (1). Here, if the effective utilization length of the cutting blade 10A when the cutter 10 is not moved is C ₁ , then C ₁ =Lc・tanθ+T......(2) Also, when the cutter 10 is not moved, it is not effectively utilized. If the length of the cutting edge 10A is _C2 , then _C2 = _C0 - _C1 (3). Therefore, the amount of movement S is determined by S=C ₂ /cosθ (4). Further, the moving speed Vs of the cutter 10 can be determined from the cutting time of the cutter 10 Tm=L/F (5) as Vs=S/Tm (6). In an actual apparatus, as shown in FIG.
Plate length L, inclination angle θ of rotating shaft 12, cutting edge 10A
Information on the length C ₀ of the cutter 10 is inputted, and based on this information, the cylinder device 20 for reciprocating the cutter 10 and the motor 18 for rotating the cutter 10 in the direction of the rotating shaft 12 is controlled. That is, the moving direction, moving speed, and moving amount of the cutter 10 are controlled by controlling the opening and closing of a control valve 24 provided in a conduit that supplies pressure oil from the hydraulic pump 22 to the cylinder device 20. . Reference numeral 26 in FIG. 1 indicates a stroke sensor attached to the cylinder device 20 for detecting the stroke of the rod 20A and outputting a signal indicating the amount of movement thereof to the control device 16. After the cutter 10 moves in the A direction and cuts the widthwise end surface 14A of the thick steel plate 14, it is returned to its original position by the cylinder device 20 during idle time until the next thick steel plate is supplied. , that is, it is moved in the direction opposite to the A direction and returns. According to the above-described device, the control device 16 controls the cutter 10 so that its cutting effect increases.
The width direction end face 14A of the thick steel plate 14 can be uniformly cut over its entire length range by moving only in the direction A and by one movement in the A direction. Therefore, the cutting efficiency is improved, and the wear of the cutter is made uniform, so that the life of the cutter can be improved. Although the above-mentioned embodiment is only for cutting one widthwise end face 14A of the thick steel plate 14, it is of course also applicable to cutting the other widthwise end face. Further, as a means for moving the cutter 10 in the direction of its rotation axis 12, the cutter 10 is moved by a cylinder device 20 together with a motor 18 that drives the cutter 10, but the present invention is not limited to this. The present invention is not limited to this, and other transportation means such as a feed screw may be used. Furthermore, although the above embodiments are for cutting a thick steel plate, the present invention can also be applied to a case where the material to be cut is a thick plate made of a material other than a steel plate.

【Effect of the invention】

Since the present invention is configured as described above, without impairing the pulling effect which is a characteristic of the inclined cutter cutting method, and by effectively utilizing the cutting edge over its entire length, cutting efficiency can be improved and the life of the cutter can be improved. This has the excellent effect of improving the

[Brief explanation of drawings]

Fig. 1 is a plan view including a partial block diagram showing an apparatus for carrying out the method for cutting the end face of a thick plate according to the present invention, Fig. 2 is a plan view showing a steel plate in a rolled state, and Fig. 3 is a conventional FIG. 4 is a plan view showing how the end face of a steel plate is cut in the width direction by the inclined cutter, and FIG. 4 is a plan view showing how the end face of the steel plate is cut when the cutter is moved vertically. 10... cutter, 10A... cutting blade, 12...
Rotating shaft, 14... Thick steel plate, 14A... Width direction end surface.

Claims (1)

[Claims] 1. A cutter equipped with a cutting edge twisted at a certain angle with respect to the rotational axis on the outer circumferential surface is opposed to the end surface in the width direction of the thick plate, and the rotational axis of this cutter is set in a plane parallel to the end surface of the thick plate. In the method for cutting an end face of a thick plate, the cutter is tilted with respect to the thickness direction of the thick plate, and the cutter is driven and rotated to trim the end face of the thick plate in the width direction. The cutter is moved from one side to the other across the widthwise end surface of the plank only in a direction that increases the cutting effect of the cutter, and the amount of movement and speed of the cutter is adjusted to the thickness and length of the plank. A method for cutting an end face of a thick plate, characterized in that the entire length range of the end face in the width direction is cut by one movement of a cutter based on cutting conditions including the above.